How EXACTLY does self-employment tax get delivered to SS and Medicare Programs?

[DolceDolce]

I know that Turbo Tax calculates the SELF-employment tax rate, and that our tax liability is presented to us.  Maybe our quarterly payments covered that part, or maybe we have to pay at the time of filing.  Regardless, what I don't understand is how does that amount for SS & Medicare get deposited into those programs, on my behalf, for my retirement?  

[DoninGA]

The Self-Employment taxes reported on the Schedule SE is sent by the IRS to the Social Security Administration.